I don't believe you've "used" it for nearly 14 hours at around 50%.
Seems like bugged process making your "usage" go up in standby.
I posted a screenshot of my actual usage that correlates with the actual time spent physically using the above mentioned iPod. I have no push notifications enabled for mail or any other installed apps causing it to run in the background like one would use on an iPhone. Your opinions of what you want believe have been noted but are irrelevant in this case.
Reference https://forums.macrumors.com/threads/1547409/